noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A polygon with nine sides; a nonagon.

Synonyms

All synonyms

9-gonnonagonnonagonnonangle

Example

More examples

"A nonagon, sometimes called an enneagon, is a polygon with nine sides."

Etymology

From ennea- + -gon.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.